I've replied to the email you sent me Andy (sorry, been out most of the day...)
And if you happened to have taken a screenshot of the error you are getting, it might help to prevent this happening to anyone else. That error "message" doesn't sound like any of the error texts I put into the confirmation code, so it may well be an SQL error (which wouldn't be nice...).
EDIT: OK, I've located you in the pilot roster - EHM-1838. Thank goodness you sent me an email, and I have SQL access to the pilot database or that might have taken a long time. Looking at the various database tables involved, I can tell you this much; there's no on-going email confirmation cycle for you as I write this, and your email address *is* unconfirmed.